What is a Duplex Strainer? How It Ensures Continuous Filtration

 


What is a Duplex Strainer?

A duplex strainer, also known as a twin basket strainer, is a type of industrial filter that removes solid particles and debris from liquids or gases. It protects pipelines, pumps, and sensitive equipment from clogging and wear.

Its twin-chamber design ensures continuous filtration, while one basket is in use, the other can be cleaned without shutting down the system. This makes it perfect for industries that demand zero downtime.

How Does a Duplex Strainer Work?

The working mechanism of a duplex strainer is simple yet smart:

  1. Fluid enters the active chamber, where it passes through a filter basket that captures contaminants.

  2. Clean fluid exits, continuing through the system.

  3. When the first basket is full, a changeover valve redirects the flow to the second chamber.

  4. The clogged basket can then be cleaned or replaced, without interrupting operations.

This seamless switch makes duplex strainers ideal for continuous, around-the-clock operations.

Key Components of a Duplex Strainer

  • Strainer Chambers – Hold filter baskets to catch dirt and particles.

  • Changeover Valve – Allows switching between baskets without stopping the flow.

  • Filter Baskets – Capture contaminants based on the selected mesh size.

  • Outer Casing – A durable shell that protects internal components.

  • Pressure Gauges – Indicate clogging by showing pressure changes.

  • Drain & Vent Ports – Make cleaning and maintenance quick and easy.

Why Duplex Strainers Are Better Than Traditional Filters

  •  Uninterrupted Filtration – No downtime, even during maintenance.

  •  Easy to Clean – Simple basket removal and cleaning without halting operations.

  •  Lower Maintenance Costs – Less wear and tear on equipment.

  •  Long-Term Savings – Prevents breakdowns and extends equipment life.

  •  Space-Efficient Design – Compact units fit into tight spaces.

  •  Strong & Durable – Built for high-pressure, high-temperature environments.

Where Are Duplex Strainers Used?

Duplex strainers are used in a wide range of industries:

  • Water Treatment Plants – Remove sand, silt, and algae before purification.

  • Oil & Gas Industry – Filter out debris that can damage pumps and meters.

  • Food & Beverage – Maintain hygiene by filtering out solids from liquids.

  • Power Generation – Protect turbines and heat exchangers from contaminants.

  • Pulp & Paper – Remove fibres and bark to ensure smoother processing.

How to Choose the Right Duplex Strainer

Here are five key factors to consider:

  1. Flow Capacity – Match the strainer to your system’s flow rate.

  2. Mesh Size – Choose based on the particle size you want to remove.

  3. Material Compatibility – Make sure it's suitable for your fluid or chemical.

  4. Operating Pressure & Temperature – Check if it can withstand your system’s conditions.

  5. Ease of Maintenance – Go for user-friendly designs with easy access for cleaning.

Conclusion

A duplex strainer ensures your industrial system runs efficiently by removing harmful particles without halting operations. It's a smart investment that reduces downtime, saves money, and protects critical equipment.

For more information, please visit

https://www.flometriq.com/blog/what-is-a-duplex-strainer/

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